Eigenschaften von ultradünnen Polymerfilmen: Wie entsteht dreidimensionales Verhalten?

超薄聚合物薄膜的特性：三维行为是如何产生的？

• 批准号: 5426577
• 负责人: Dr. Torsten Kreer
• 金额: --
• 依托单位: Institut Charles Sadron
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5426577?language=en
• 关键词: Eigenschaften; von; ultrad; nnen; Polymerfilmen

Structural and dynamical properties of ultrathin polymer films will be analyzed by computer simulations. The planned simulations consider, on the one hand, strictly two-dimensional systems, where all monomers of the polymer chains are attached to a flat substrate, and on the other hand, ultrathin films, where small excursions of monomers into the third dimension are allowed. For dense systems and long chains, the latter choice leads to strong entanglements between the chains, as in three dimensions. Polymers that can move over each other should thus hamper themselves in their motion much more than strictly twodimensional systems. A recent theory, which provides quantitative predictions about these modifications, will be tested carefully via the computer simulations. Since this theory also suggests that the well-established "reptation model" of Edwards, Doi and de Gennes might not be the correct description of the polymer relaxation in the asymptotic limit of large chains, as commonly assumed, the results of the planned project could present a very important contribution to a fundamental problem in polymer physics.

通过计算机模拟分析了聚合物薄膜的结构和动力学性质。计划的模拟考虑，一方面，严格的二维系统，其中的聚合物链的所有单体都连接到一个平面基板，另一方面，dielectric薄膜，其中允许小的偏移到第三维的单体。对于稠密系统和长链，后一种选择导致链之间的强纠缠，如在三维中。因此，可以相互移动的聚合物应该比严格的二维系统更能阻碍它们自身的运动。最近的一个理论，它提供了有关这些修改的定量预测，将通过计算机模拟仔细测试。由于这一理论还表明，爱德华兹，土井和德Gennes的完善的“爬行模型”可能不是大链渐近极限中聚合物弛豫的正确描述，正如通常假设的那样，计划项目的结果可能对聚合物物理学中的一个基本问题做出非常重要的贡献。